Comparison of optical, structural and electrochromic properties of undoped and WO3-doped Nb2O5 thin films

Pehlivan, Esat; Tepehan, Fatma Z.; Tepehan, G.G.

doi:10.1016/j.ssi.2003.08.021

Cited by 37 publications

(14 citation statements)

References 21 publications

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“…The interest in niobium pentoxide Nb 2 O 5 has increased in the last decade because of its promising electrochromic properties (Maček et al 1997, Pehlivan et al 2003Pehlivan et al 2005;Heusing et al 2006;Mujawar et al 2006Mujawar et al , 2007Romero et al 2009 …”

Section: Niobium Oxidementioning

confidence: 99%

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Bætens

Jelle

Gustavsen

2010

Solar Energy Materials and Solar Cells

1,149

591

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A survey on prototype and currently commercial dynamic tintable smart windows has been carried out. The technologies of electrochromic, gasochromic, liquid crystal and electrophoretic or suspended-particle devices were examined and compared for dynamic daylight and solar energy control in buildings. Presently, state-of-the art commercial electrochromic windows seem most promising to reduce cooling loads, heating loads and lighting energy in buildings, where they have been found most reliable and able to modulate the transmittance up to 68 percent of the total solar spectrum. Their efficiency has already been proven in hot Californian climates, but more research is necessary to validate the products for colder climates, and to improve furthermore the commercial products in order to control the indoor climate in a more energy efficient way by reducing both heating and cooling loads.

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Section: Niobium Oxidementioning

confidence: 99%

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Bætens

Jelle

Gustavsen

2010

Solar Energy Materials and Solar Cells

1,149

591

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“…A few researchers have investigated the effects of mixed electrochromic films (e.g., TiO 2 , V 2 O 5 , Nb 2 O 5 and Mo) for improved durability, color neutrality, coloration efficiency, and optical modulation [15][16][17][18][19][20]. However, the energy band gap, optical modulation, coloration efficiency and reversibility of WO 3 -doped Nb 2 O 5 films and Nb-doped WO 3 films deposited by pulsed spray pyrolysis [21,22], electron beam co-evaporation [23] or sputtering have rarely been investigated and there has been no comparison made between the lifetimes of undoped WO 3 and Nb 2 O 5 -doped WO 3 films. Furthermore, LiNbO 3 [24][25][26] and LiTaO 3 [27,28] served as the ion electrolyte layer in monolithically electrochromic devices.…”

Section: Introductionmentioning

confidence: 99%

An All-Solid-State Electrochromic Device Based on WO3–Nb2O5 Composite Films Prepared by Fast-Alternating Bipolar-Pulsed Reactive Magnetron Sputtering

Tang

Jaing

et al. 2018

Coatings

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In this study, WO3–Nb2O5 electrochromic films and an ITO/WO3–Nb2O5/Nb2O5/NiVOx/ITO all-solid-state electrochromic device were deposited using fast-alternating bipolar-pulsed magnetron sputtering using tungsten and niobium targets. The influence of different sputtering powers from the niobium target on the refractive index, extinction coefficient, optical modulation, coloration efficiency, reversibility, and durability of the WO3–Nb2O5 films is discussed. The aim of this work is to find the suitable Nb proportion to increase durability and less negative effect in the electrochromic performance of Nb2O5-doped WO3 films. The lifetime of the WO3–Nb2O5 films is 4 times longer than pure WO3 films when the sputtering power of the Nb target is higher than 250 W. The results show that WO3–Nb2O5 composite films used for an all-solid-state electrochromic device can sustain over 3 × 104 repeated coloring and bleaching cycles while the transmission modulations can be kept above 20%. The coloring and bleaching response times are 7.0 and 0.7 s, respectively.

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“…Many studies proved that the metal oxides, such as WO 3 , Nb 2 O 5 , V 2 O 5 , Ta 2 O 5 , TiO 2 , Ir(OH) 3 and CeO 2 , have good electrochromic properties and may be suitable as photoelectrodes in water splitting [4][5][6][7][8][9]. The changes of color due to the electrochromic properties can modify the light absorption range from UV to VIS and as consequence will contribute to obtain the energy needed for water splitting.…”

Section: Introductionmentioning

confidence: 99%

Study of photoactivity of tungsten trioxide (WO3) for water splitting

2007

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Comparison of optical, structural and electrochromic properties of undoped and WO3-doped Nb2O5 thin films

Cited by 37 publications

References 21 publications

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

An All-Solid-State Electrochromic Device Based on WO3–Nb2O5 Composite Films Prepared by Fast-Alternating Bipolar-Pulsed Reactive Magnetron Sputtering

Study of photoactivity of tungsten trioxide (WO3) for water splitting

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